Insulator for spark plugs



Feb. 21,1933. w. F. RIDGE 1,898,064

INSULATOR FOR SPARK PLUGS Filed Dec. 28, 1927 lll flm. Hu 2 [N VEN T 01?W/u mm A TTORNEYS,

to any standard spark Patented Feb. 21, 1933 'UN ITED STATES PATENTOFFICE WILLIAI 1'. EDGE, 01' AKRON, OHIO IIN'BULATOB FOB SPARK PLUGSApplication area December as, 1921. serial Io. 848,080..

The present invention relates to an insulating sleeve or protectorespecially adapted and intended for spark plug connections, beingdesigned for theprotection of the plug connections from water and toprevent the escape of the electrical sparks from the exposed metal partsof the spark plug.

Thedevice as shown and described herem is simple and easily applied. Itcan be fitted lug and does not interfere in any way with making theusual connections between the plug and the conductor. The advantages ofthe insulator will be more fully and completely understood from thedetaileddescription contained here- In the single figure of the drawingis shown a standard spark plug with the insulator in place thereon, itbeing understood that chan es and modifications may be made withouteparting from the essential features of the inventio In the drawing, 1represents the wall of an engine in which is mounted the spark plug 2 ofusual construction, having a post 3 on which is threaded the nut 4securing the usual electrical conductor 5 in position thereon.

'The insulator comprises a sleeve of rubber 6 which is somewhat largerand flaring at its 0 inner end which is adapted to fit and gri over theupper portion or body of the spar plug and preferably having a beadedlower 'edge. The elongated, tapering smaller end of the sleeve fits overthe leadlng-in wire or 3 conductor 5, being rolled up at its outer endas shownat 8, the rolling of the sleeve causing the end thereof to gripthe conductor tightly. The sleeve, of course, is composed 40 offlexible, resilient rubber in order to perform these functions.-

In applying the insulator, the smaller end I is passed over theconductor and the connection made between the conductor and the sparkplug. The larger end may then be drawn over the plug which it willnormally grip tightly enough to hold the insulator ,then rolled onitself'to' -j'form th due to the inherent resilience v0 10 may beprovided in the insulator to prevent sweating.

The device has advantages of simplicity and utility over prior attemptsat similar constructions as it is applicable to the standard form ofspark lug and does not interfere with making theelectrical connectionsat the plug. It is also inexpensive and will operate satisfactorily forthe pur oses set forth. The insulator may be molde in curved form, ifdesired, alth'ough a straight sleeve will operate satisfactorily aswell.

What is claimed is:

1. In-combination an insulator and a spark plug having an electricalconductor leading thereto, said insulator comprising a flexible,resilient, rubber sleeve ta erin from a diameter at its larger end aapte to fit snugly about the sparkplug body grip ing the same f therubber to a diameter atits smaller end to fit snu ly about theelectrical conductor, the smafier end of the insulator being rolled uponitself and thereby gripping the conductor.

2. In combmation an insulator and a spark plug having an electricalconductor leading thereto at right angles, said insulator comprising aflexible, resilient rubber 'sleeve formed at substantially a rightangle, said sleeve tapering from a diameter at its larger end, adaptedto fit snugly about the spark plu body, to a diameter at its smaller endto t snugly about the electrical conductor the smaller end of theinsulator being rolled upon itself to thereby gri the conductor, theintermediate portion of e sleeve loosely enclosing the connectionbetween the spark plug and the conductor.

WILLIAM F. RIDGE.

